


Make two statements before the introduction:
The following code can be run directly. Of course, don’t forget to quote jQuery.
<script><br />// DeviceOrientation provides high-level encapsulation of the underlying direction sensor and motion sensor, providing support for DOM events. <br />// This feature includes two events: <br />// 1. deviceOrientation: an event that encapsulates the orientation sensor data, which can obtain the orientation data of the mobile phone when it is stationary (the angle, orientation and orientation of the mobile phone, etc.) . <br />// 2. deviceMotion: Encapsulates the events of the motion sensor and can obtain data such as motion acceleration when the mobile phone is in motion. <br />// Using these two events, you can easily implement interesting functions such as gravity sensing and compass. <p>// Now there is a very common and fashionable function in many Native applications - shake to find people, shake to read news, shake to find gold coins. . . <br />// Maybe you already know this function very well on the android or ios client, but now, I will tell you how to implement the shake function on the mobile web page. <p>// OK, let’s start now, hehe~<br />// Let’s first understand the device motion events——DeviceMotionEvent: Returns the relevant information about acceleration and rotation of the device, where the acceleration data includes The following three directions: <br />// x: horizontally across the phone screen; <br />// y: vertically across the phone screen; <br />// z: vertically across the phone screen. <br />// In view of the fact that some devices do not exclude the influence of gravity, this event will return two attributes: <br />// 1. accelerationIncludingGravity (acceleration including gravity) <br />// 2. acceleration (excluding the influence of gravity) Acceleration) <p>// As a coder, the most direct way is to code. Come on and start coding! <p>//First, listen for motion sensing events on the page<br />function init(){<br /> if (window.DeviceMotionEvent) {<br /> // Mobile browsers support motion sensing events<br /> window.addEventListener('devicemotion', deviceMotionHandler, false);<br /> $("#yaoyiyaoyes").show();<br /> } else{<br /> // Mobile browsers do not support motion sensing events<br /> $("#yaoyiyaono").show();<br /> } <br />} <p>// So, how do we calculate whether the user is shaking the phone? You can consider the following points: <br />// 1. In fact, when users shake their phones, they always shake in one direction; <br />// 2. When users shake their phones, they move in x, There will be corresponding changes in the speed in the three directions of y and z; <br />// 3. The user’s normal mobile phone movement behavior cannot be regarded as shaking (the phone is placed in the pocket, and the acceleration will also change when walking) ). <br />// Considering the above three points, calculate the acceleration in the three directions, measure them at intervals, examine their rate of change in a fixed period of time, and determine a threshold to trigger the operation after shaking. . <p>// First, define a shaking threshold <br />var SHAKE_THRESHOLD = 3000;<br />// Define a variable to save the time of the last update <br />var last_update = 0;<br />// Tight Then define x, y, z to record the data of the three axes and the time of the last departure <br />var x;<br />var y;<br />var z;<br />var last_x;<br />var last_y;<br />var last_z; <p>//In order to make this example a little more boring and interesting, add a counter <br />var count = 0; <p>function deviceMotionHandler(eventData) {<br /> // Get acceleration including gravity <br /> var acceleration = eventData.accelerationIncludingGravity; <p> // Get the current time <br /> var curTime = new Date().getTime(); <br /> var diffTime = curTime -last_update;<br /> // Fixed time period <br /> if (diffTime > 100) {<br /> last_update = curTime; <p> x = acceleration.x; <br /> y = acceleration.y; <br /> z = acceleration.z; <p> var speed = Math.abs(x y z - last_x - last_y - last_z) / diffTime * 10000; <p> if (speed > SHAKE_THRESHOLD) { <br /> // TODO: Here you can implement the data logic operations to be performed after shaking <br /> Count ;<br /> $("#yaoyiyaoyes"). hide ();<br /> } <p> last_x = x; <br /> last_y = y; <br /> last_z = z; ="font-size:20px;margin:10px;line-height:35px;display:none;"><br />Brother, if you see me, it means you can't shake it yet, but it doesn't mean you are not qualified to use me. , instead: <br />1. If you are using a PC browser, that is wrong. I only like mobile browsers; <br /> 2. If you are using an Android phone, I am sorry to tell you that Android comes with The browser abandoned me, you can use third-party browsers such as UCWeb and chrome; <br /> 3. If you do not fall into the above two situations, then I can only tell you: you need to change your mobile phone! ! ! <br /></script>
<script><br />$(document).ready(function(){<br />init();<br />});<br /></script>

html5的div元素默认一行不可以放两个。div是一个块级元素,一个元素会独占一行,两个div默认无法在同一行显示;但可以通过给div元素添加“display:inline;”样式,将其转为行内元素,就可以实现多个div在同一行显示了。

html5中列表和表格的区别:1、表格主要是用于显示数据的,而列表主要是用于给数据进行布局;2、表格是使用table标签配合tr、td、th等标签进行定义的,列表是利用li标签配合ol、ul等标签进行定义的。

固定方法:1、使用header标签定义文档头部内容,并添加“position:fixed;top:0;”样式让其固定不动;2、使用footer标签定义尾部内容,并添加“position: fixed;bottom: 0;”样式让其固定不动。

HTML5中画布标签是“<canvas>”。canvas标签用于图形的绘制,它只是一个矩形的图形容器,绘制图形必须通过脚本(通常是JavaScript)来完成;开发者可利用多种js方法来在canvas中绘制路径、盒、圆、字符以及添加图像等。

html5中不支持的标签有:1、acronym,用于定义首字母缩写,可用abbr替代;2、basefont,可利用css样式替代;3、applet,可用object替代;4、dir,定义目录列表,可用ul替代;5、big,定义大号文本等等。

html5废弃了dir列表标签。dir标签被用来定义目录列表,一般和li标签配合使用,在dir标签对中通过li标签来设置列表项,语法“<dir><li>列表项值</li>...</dir>”。HTML5已经不支持dir,可使用ul标签取代。

html5是指超文本标记语言(HTML)的第五次重大修改,即第5代HTML。HTML5是Web中核心语言HTML的规范,用户使用任何手段进行网页浏览时看到的内容原本都是HTML格式的,在浏览器中通过一些技术处理将其转换成为了可识别的信息。HTML5由不同的技术构成,其在互联网中得到了非常广泛的应用,提供更多增强网络应用的标准机。

3种取消方法:1、给td元素添加“border:none”无边框样式即可,语法“td{border:none}”。2、给td元素添加“border:0”样式,语法“td{border:0;}”,将td边框的宽度设置为0即可。3、给td元素添加“border:transparent”样式,语法“td{border:transparent;}”,将td边框的颜色设置为透明即可。


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